subnet.im

AS21021Multimedia Polska Sp. z o.o.

PolandRegistryRIPE NCCTypeEyeball

As of 11th November 2026, AS21021 (Multimedia Polska Sp. z o.o.), an access network registered in Poland with RIPE NCC, originates 45 IPv4 prefixes covering 635k addresses and 2 IPv6 prefixes. By IPv4 address space that makes it the 623rd-largest of the 80,743 networks we see originating IPv4, and the 7th-largest of 2,109 in Poland. It is seen behind 1 upstream network, most often AS29314 (VECTRA S.A.), and in front of 22 downstream networks. 98% of its announcements have a valid RPKI ROA, and none are RPKI-invalid. 100% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

45

IPv6 prefixes

2

IPv4 addresses

635k

IPv6 /64s

8.6B

Upstream graph

The networks AS21021 is seen behind, one and two hops out, drawn from real AS paths.

AS21021Toward the internet core
Upstream graph for AS21021: 3 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS21021Multimedia Polska…This networkAS29314VECTRA S.A.AS1299Arelion (fka. Tel…AS3356Lumen (Level 3)

Networks observed one and two hops upstream of AS21021 in real AS paths. A thicker line means more vantage points saw that adjacency, so weight tracks how well attested it is — not how much traffic it carries. Adjacency is an observation; whether it is a transit purchase or a settlement-free peering is an inference, and is labelled as one wherever we show it.

Neighbouring networks

46

adjacent networks

Upstreams
12%
Peers
2350%
Downstreams
2248%

Networks carrying this one's traffic toward the rest of the internet.

Upstreams of AS21021
NetworkCountryRelationshipPathsVantage pts
AS29314VECTRA S.A.PLPeer4,360137

Prefixes

All 47

The largest blocks AS21021 originates, widest first.

Largest prefixes originated by AS21021
PrefixAddressesVisibility
81.190.0.0/1665.5k76/76
89.228.0.0/1665.5k76/76
89.229.0.0/1665.5k76/76
89.230.0.0/1665.5k76/76
89.231.0.0/1665.5k76/76
37.190.128.0/1732.8k76/76
46.186.0.0/1732.8k76/76
94.251.128.0/1732.8k76/76
31.6.128.0/1816.4k76/76
62.141.192.0/1816.4k76/76

Routing health

How AS21021's own announcements validate against RPKI and how far they propagate. The same measures for the whole routing table are on the routing table in numbers.

RPKI origin validation

  • Valid97.9%46
  • Invalid0.0%0
  • No ROA2.1%1

Propagation

  • Globally propagated90% of full-feed peers or more100.0%47
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 45 prefixes

IPv6 — 2 prefixes

  • /324.3B × /64100.0%2

Recent changes

Announcements that started or stopped since 12th Oct 2026.

No announcement by AS21021 started or stopped in this period.

Routing data derived from RouteViews MRT archives, BGPKIT relationship inference and public registry data.